<html><body>Opps!, sorry I used a slang word. Should have said "thou". Best oil channel for conventional oil is .0015"...not microns.<div><br></div><div>The synthetic oil leaks from the transmission and overdrive come from seepage around the lockout switch, annular ring and any protruding bolts that could seep around the threads. Conventional oil-due to its larger molecule size can't sneak out as easily. I only used the bearing clearance as a reference to the size of oil channels found in older engines. Sorry to offend. Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: warthodson@aol.com<br>To: gradea1@charter.net, healeys@autox.team.net<br>Cc: <br>Sent: Sunday January 12 2020 11:35:06AM<br>Subject: Re: [Healeys] Does synthetic oil leak more?<br><br>
<div style="color:black;font: 10pt arial;">
What does bearing clearance have to do with oil leaks?
<div>
You must have some very precise holes in your transmission that allows only synthetic oil to escape. I am not buying that theory.
</div>
<div>
Gary <br>
<br>
<br>
<div style="font-family:arial,helvetica;font-size:10pt;color:black">
-----Original Message-----<br>
From: gradea1 <gradea1@charter.net><br>
To: 'warthodson@aol.com' <warthodson@aol.com><br>
Sent: Sun, Jan 12, 2020 12:19 pm<br>
Subject: Re: [Healeys] Does synthetic oil leak more?<br>
<br>
<div id="yiv2284244539">
<div>
<div style="margin-bottom:1em;font-size:17px;line-height:26px;color:rgb(33, 37, 41);font-family:-apple-system, system-ui, BlinkMacSystemFont,;">
Found this info by looking for the molecule size of synthetic oil. Most conventional oil is about 2 microns and that is why we set our bearing clearance at .002 to allow the oil to pass. Early machining does not match what we have today with the close tolerances we can now achieve...so the finer synthetic runs out. If I run Redline in my Healey trans it ends up on the floor. Regular 30W stays in, and only leaves a quarter size puddle. Used lots of good sealant but that wont keep the new oils in if they are good soldiers:
</div>
<div style="margin-bottom:1em;font-size:17px;line-height:26px;color:rgb(33, 37, 41);font-family:-apple-system, system-ui, BlinkMacSystemFont,;">
"The main difference between synthetic motor oil and conventional motor oil is found in their molecular structure. In a mineral oil, the molecules come from organic, natural materials, and as we know, nature isn't always consistent. There can sometimes be a few oddball molecules in mineral oils. <a target="_blank" rel="noopener noreferrer" shape="rect" style="color:rgb(11, 91, 164);text-decoration-line:none;background-color:transparent;border-bottom:2px solid rgb(221, 221, 221);" href="https://auto.howstuffworks.com/under-the-hood/trends-innovations/synthetic-oil-technology.htm">Synthetic oils</a>, on the other hand, were created by scientists in a lab. The molecules are uniform, and they line up like good soldiers inside of your engine."
</div>
<div class="yiv2284244539recirc-panel yiv2284244539margin-bottom1" style="margin:0px;padding:1em 0px;clear:left;color:rgb(33, 37, 41);font-family:-apple-system, system-ui, BlinkMacSystemFont,;">
See illustration attached- Hank<br style="clear: none;">
</div>
<br style="clear: none;">
<div class="yiv2284244539reply-new-signature">
</div>
<div class="yiv2284244539yqt2045935791" id="yiv2284244539yqt94457">
<div>
<br>
</div>
</div>
</div>
</div>
</div>
<style>#yiv2284244539 v00003a* {}#yiv2284244539 o00003a* {}#yiv2284244539 w00003a* {}#yiv2284244539 .yiv2284244539shape {}</style><style>#yiv2284244539 -- filtered {}#yiv2284244539 filtered {}#yiv2284244539 filtered {}#yiv2284244539 p.yiv2284244539MsoNormal, #yiv2284244539 li.yiv2284244539MsoNormal, #yiv2284244539 div.yiv2284244539MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv2284244539 a:link, #yiv2284244539 span.yiv2284244539MsoHyperlink {color:blue;text-decoration:underline;}#yiv2284244539 .yiv2284244539MsoChpDefault {}#yiv2284244539 filtered {}#yiv2284244539 div.yiv2284244539WordSection1 {}#yiv2284244539 </style>
</div>
</div>
</div></body></html>